Closure construction for metallic containers



Sept. 30, 1952 J. R. SNYDER 2,612,284

CLOSURE CONSTRUCTION FOR METALLIC CONTAINERS Filed May 28, 1949 Patented Sept. 30, 1952 CLOSURE CONSTRUCTION FOR METALLIC CONTAINERS Jacob Rush Snyder, Cleveland; Ohio, assignor to Thompson Products, Inc Cleveland, Ohio, a

corporation of Ohio Application Maya, 1949, scrim No. 95,919

This invention relates generally to a'bung bushing construction for the filling and discharge opening of metallic containers such as drums, and the like, and it has to do especially with the construction of the bushing and the supporting member therefor in order, that a bungbushing n3:

construction may be assembledto a drum head more economically than other known forms of bung bushing constructions. g This invention is particularly usefu1 in con nection with containers used for the transportation and storage of gasoline, oil, and the like.

Prior to my invention, it hasbeen customary to form the bung bushing construction on the exterior of the drum head, making it very dimcult to form the drum head chime with rollers unless the closure bushing; was spaced a con,- siderable distance away fronrthe edge of the drum to provide room for the chime rollers. Also, in transit and storage with the prior type of bung bushing construction formed on the outside of the drum head, the adapter cover is easily damaged by carelessly rolling and stacking one drum upon another. It is'also necessary with the prior art type of bung bushing construction to tip the drum to removethe'fiuid because'of the distance of the bung bushing construction from the drum head chime.

The present invention now provides an internal bung bushing for drum heads. This bushing comprises an internally threaded bushing ring seated in a polygonal stamped housing'or adapter that is-Welded to the inside face of the drum head. The drum hole in the drum head is provided with an inwardly projecting flangereceiving a portion of the-bushing ring therearoundfor centering the ring in the hole. Asingle gasket'or seal ring-positioned on the b'ushing ringseals the closure plug to the ring and the ring to the drum head flange. Since the resulting construction is inside the drum, no chime ring roller interference is encountered and the drum hole can be very close to the side wall of the drum;

It is therefore a principal object of the present invention to provide an internal drum head bushing construction. 1

Another object of the present invention'is. to provide an improved bung bushing construction that does not extend beyond 'thejo'utside surface of the'drum head so that there is'no interference to the rollers thatform the drum head chime.

'Another object of the invention 'is to provide a bung bushing construction in which the center of the bushing is very close'to the drum head to which the drum head I2 is affixed by a drum chime and permits full drainageof the drum from a'horlzontalposition. v 7

Another object of thefinvention is to provide a bushing for a bungbushing construction which may be die cast, stamped, or forged and assembled to the drum head more economically thanother formsof bushings.

Another object of the invention is to provide a support stamping for the bushing which may beprojection, spot or seam welded, making the application thereof to the drum head very low incost. 1

.Another object of the invention is to provide a single seal which seals boththe conventional I closure plug and/or adapter mounted in the closure'bushing. and the, bushing.

Other and further objects of the invention will be apparent from the following description of the annexed sheet of drawings, which illustrate the preferred embodiments of the invention.

On the drawings:

Figure 1 is an external elevational view with a partbroken away to show underlying structure illustrating the improved bung bushing construction'andtamper proof cap for the closure plug thereof; A l

Figure 2 is a sectional view taken along the line II -II of Figure 1;

Figure 3 is'an lnSlde elevational view of the supporting member for the bushing of the improved bung bushing construction of Figure 1;

Figure 4 a vertical sectional viewtaken along 7 line IV- IV of Figure 3 showing the-bung bushing construction withthe closureplug removed;

Figure 5 is a fragmentary sectional'view illustrating another form of internal bushing and the projections for welding the bushing directly to the drum head; and

Figure 6 is a sectional view illustrating the bushing of Figure, 5 welded in position to the drum-head.

As shown on the drawings:

Referring to Figure 1, the reference character l0 designates generally a conventional metal drum including a cylindrical side wall or shell I I head chime I3. The drum head I2 is secured to the'drum side wall I l by'the interlocking flanges 2 as shown sectionally in Figure 4 over which is rolled the drum head chime to seal the drum.

The bung bushing construction I4, as illustrated in Figures 1'-4, is mounted in the drum [0 upon theinterior face of the drum head l2. The construction 14 includes a closure bushing or bushing ring 15 receiving a conventional closure plug l6which can be covered with a conventional tamper-proof cap ll. Inasmuch as the bungbushing construction [4 with the closure plug and cap does 'not extend beyond the outside surface of the drum head l2, there is no interference to the rollers which form the drum head chime l3, and the' drain hole 18' can be closer to the chime 13 by' substantially 1 inch as compared with the conventional external type of bung bushing construction'.

at 1-9 to seat the closure bushing l (Figures 2 The closure bushing I5 is preferably die cast or forged to the octagonal shape as shown and 4) in Figure 3 and complementally shaped with respect to a supporting member or adapter 25, as

illustrated in Figures 3 and' l, with the octagonal portions to receive the bushing and with a flanged portion 2! afiixed against the interior face of the drum head. The bushing is threaded as in Figure 4 to receive the closure plug l6 (Figure 2) and is also formed with an annular recess 22 to receive the inwardly extending flange IQ of the drum head to assure positive centering during. the welding operation. In the welding operation; the supporting member 29, which is preferably formedof a metal stamping, may be spot-welded as at 2.3 (Figures 1 and 3) to the drum head l2. Following this procedure, the assembly of the closure. bushing 1-5. and supporting memberr'zfi .of thedrumhead is a simple and very low cost operation. Although it'ls preferred to spot weld. the member 20 to the drum head, itis, withinthe scope of the invention that this member may be a projection or seam welded to the drum head.

Althoughthe closure bushing l5 and thesupporting member 2i] therefore are preferably formed to prevent turning of; the bushing with respect to its supporting membeiyit is also to be understood that it is within the scope of this invention that any suitable shape may be utilized for the member as long as the shape of themembers are so formed that there is no relative turn: ing of. the bushing with respect to its supporting member.

J In Figures 1 and 2-, a preferred form of closure plug it; isillustrated which may be used for a closure for the bung bushing I5; The plug [6, as the bushing l-5 may be formed by die casting oriorging, and is threaded complementallytc the bushingl 5 and is provided with a recessed or depressed outerface as shown in Figure 2. Diametrically opposed lugs 2-4 are also provided for securing the, cap in position as shown in Figure 2 with a suitably formed tool engaging the lugs 24;

The closure plug is also provided with inwardly extending projection 25 provided with. a hole 25 to which a suitable locking chainmay be attached, as is Well understood in theatre prevent loss of the closure plug when the plug is. detached for emptying the'drum. p Y The. single seal construction which is. preferred for the closure assembly to positively seal the container opening againstleakage isproyided by a resilient O-ring type seal 21. The material from which the seal is preferably formed is a suitable synthetic rubber-like materialnot afiected by the gasoline. or other types of high volatile fluidsdisposedwithin the container and. holds gasoline when tested under the most severe specifications. The seal .is positioned to be supported by a surface 28 formed by the annular recess 22 offthe bushing l5, the inwardly flanged portion [9 of the drum head l2 and the annular" flange 29 of the closure plug 16.. p .Referring to. Figure 2, it is evident that when the O-ring 2.1 isin position as shown; and, upon the plug being secured. in place, the 0 ring, which is usually mounted upon the plug, is positioned intoits sealing relationship. with the restof the bung bushing construction. The 0-ring seals any leakage path formed by the threads of thebush ing and the plug and also provides a seal for v 4 any leakage path between the surface of the bushing I5 and the inner peripheral surface of the supporting member and also any leakage path between the flanged portion 2| and the wz-bushing it where they engage the drum head in assembled position, for example, as shown in Figure 2. With this construction of my invention, it

is evident that there is eliminated the heretofore 'oonventionalexpensive spinning operation to seal the outer end of the closure bushing over the outturned drum head flange and the heretofore necessary additional sealing gasket.

Undesirable tampering of the contents of the drum is prevented by covering the closure plug IS with the tamper-proof cap l1. Referring to Figures 1 and 2, a tamper-proof cap I! is illustrated having an annular U- shaped flange30 complementally formed with respectto the flange 29 of the closure plug; The closure plug is'pro videdwith diametrically opposed holes 3| which extend through both legs of the flange 36 and are complementally formed with respect to holes 32 formed in the closure plug. A wire 33 passes through the holes Stand 32, as shown in Figure 2, thus securing the tamper-proof capin position; In the modified embodiment of the invention shown in Figures 5 and 6, the supporting member or adapter 20 is eliminated and a forged bushing I5a is directlyspot welded to the inside face of the drum head 12 around theiinturned flange l9 thereof. As shown in Figure 5, the recess 22 of the bushing l5a receives the head flange l9 and issurrounded by an'outturned' flange 40 having a plurality of small teats or. projections 4| at spaced intervals bottomed on the drum head l2. These projections are flattened flush with the flange during a spot welding operation and form weld bonds 42 shown in Figure 6 integrally joining the drum headand bushing l5a. This welded on bushing 15a receives a seal and threaded in closure plug in thesame manner as the bushing I5 From, the above description, it isobvi'ous that there has been described a low cost bung bushing construction, and the parts thereof may be readily formed in production by die casting or the like or by metalstamping. The drum head is also formed bya suitable stamping operation with an inwardly flared; opening to locate the bushing in position, whereupon it may base: cured in position by welding the support member therefor to the drum head prior to the assembly of the drumhead into the drum. 7 n I It. will of course, be understood that various details of construction may be variedthrough a wide range without departing from-theprinciplesof this invention, and it is, therefore, not thepurpose to limit the patent granted hereon otherwise than necessitated by the srsdpeof the appended claims.

II claimasmy invention:

l. A. bun-g bushing assembly comprising a drum head defining a, bung hole, said drumfhead hav ing an inwardly extending flangesurrounding the bung .hole,. a. polygonal-sided bushing ring defininga threaded bore and a counterbore, said counterbore snugly receiving said flange, .and a generally I cup-shaped polygonal sided housing snugly surrounding the bushingring, said housing defining anaperture in registry with, the said bung hole and havinga peripheral flange attached in abutting assembly on the. insidej o f the drum head, whereby the bushing ring will be concealed behind the drum head in position for receiving a closure bung.

2. A bung bushing assembly comprising a drum head defining a bung hole, said drum head having an inwardly extending flange surrounding the bung hole, a polygonal-sided bushing ring defining a bore and a counterbore, said counterbore snugly receiving said flange, and a generally cup-shaped polygonal-sided housing snugly surrounding the bushing ring, said housing defining an aperture in registry with the said bung hole and having a peripheral flange attached in abutting assembly on the inside of the drum head, whereby the bushing ring will be concealed behind the drum head in position for receiving a closure bung, and a substantially cup-shaped externally threaded closure plug in the bore of the bushing ring.

3. A bung bushing assembly comprising a drum head defining a bung hole, said drum head having an inwardly extending flange surrounding the bung hole, a polygonal-sided bushing ring defining a threaded bore and a counterbore, said counterbore snugly receiving said flange, and a generally cup-shaped polygonal-sided housing snugly surrounding the bushing ring, said hensing defining an aperture in registry with the said bung hole and having a peripheral flange attached in abutting assembly on the inside of the drum head, whereby the bushing ring will be concealed behind the drum head in position for receiving a closure bung, and a substantially cup-shaped externally threaded closure plug threaded in the bore of the bushing ring, said plug having a non-threaded reduced diameter cylindrical portion terminating in a radially extending flanged rim, the rim adapted to lie substantially flush with the drum head when the plug is assembled in the bushing.

4. A bung bushing assembly comprising a drum head defining a bung hole, said drum head having an inwardly extending flange surrounding the bung hole, a polygonal-sided bushing ring defining a threaded bore and a counterbore, said counterbore snugly receiving said flange, and a generally cup-shaped polygonal-sided housing snugly surrounding the bushing ring, said housing defining an aperture in registry with the said bung hole and having a peripheral flange attached in abutting assembly on the inside of the drum head, whereby the bushing ring will be concealed behind the drum head in position for receiving a closure bung, and a substantially cup-shaped externally threaded closure plug in the bore of the bushing ring, said plug having a non-threaded reduced diameter cylindrical portion terminating in a radially extending flanged rim, the rim adapted to lie substantially flush with the drum head when the plug is assembled in the bushing, and a gasket surrounding the cylindrical portion of the plug, abutting the drum head flange and lying between said flanged rim and the bushing ring to effect a seal between the interior of the drum and the atmosphere.

5. A bung bushing assembly comprising a drum head defining a bung hole, said drum head having an inwardly extending flange surrounding the bung hole, a polygonal-sided bushing ring defining a threaded bore and a counterbore, said counterbore snugly receiving said flange, and a generally cup-shaped polygonal-sided housing snugly surrounding the bushing ring, said housing defining an aperture in registry with the said bung hole and having a peripheral flange attached in abutting assembly on the inside of the drum head, whereby the bushing ring will be concealed behind the drum head in position for receiving a closure bung, and a substantially cupshaped externally threaded closure plug in the bore of the bushing ring, said plug having a nonthreaded reduced diameter cylindrical portion terminating in a radially extending flanged rim, the rim adapted to lie substantially flush with the drum head when the plug is assembled in the bushing, and a gasket surrounding the cylindrical portion of the plug, abutting the drum head flange and lying between said flanged rim and the bushing ring to eiTect a seal between the interior of the drum and the atmosphere, said plug defining a pair of lugs in the hollow portion thereof cooperable with an actuating tool.

6. A bung bushing assembly comprising a drum head defining a bung hole, said drum head having an inwardly extending flange surrounding the bung hole, a polygonal-sided bushing ring defining a threaded bore and a counterbore, said counterbore snugly receiving said flange,

.and a generally cup-shaped polygonal-sided housing snugly surrounding the bushing ring, said housing defining an aperture in registry with the said bung hole and having a peripheral flange attached in abutting assembly on the inside of the drum head, whereby the bushing ring will be concealed behind the drum head in position for receiving a closure bung, and a substantially cup-shaped externally threaded closure plug in the bore of the bushing ring, said plug having a non-threaded reduced diameter cylindrical portion terminating in a radially extending flanged rim, the rim adapted to lie substantially flush with the drum head when the plug is assembled in the bushing, and a gasket surrounding the cylindrical portion of the plug, abutting the drum head flange and lying between said'flanged rim and bushing ring to effect a seal between the interior of the drum and the atmosphere, said plug defining a pair of lugs in the hollow portion thereof cooperable with an actuating tool, said flanged rim defining a pair of diametrically opposed apertures, a tamperindicating disc adapted to be crimped over said rim, and a sealing wire passing through said disc and said apertures, whereby the closure plug may not be withdrawn from the bushing ring without disturbing the tamper-indicating disc and the sealing wire.

JACOB RUSH SNYDER.

REFERENCES CITED The following references are of record in the file of this patent:

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